Carburetor



'se t 25, 1928.

H. C. ABERN CARBURETOR Filed Sept. 19, 1925 I N V EN TOR.

Patented Sept. 25, 1928.

UNITED STATES PATENT OFFICE.

HALSEY C. ABEBN, OF CHICAGO, ILLINOIS.

CARIBURETOR.

Application filed September My invention relates to a new and useful lIIII'H'OVQIIlOIlt in a carburetor and has for its object, the provision of a carburetor having means for producing a. vacuum in the car buretor adapted for dispensing with the vacuum tank now customarily used with the oil supply systems of motor vehicles.

Another object of the invention is the provision in av carburetor haveing a plurality of fuel ports of means for closing one of said ports upon the flow of fuel through the other of said ports in suflicient quantities.

Another object of the invention is the provision in a carburetor of sealing means, adapted for sealing a portion of said carburetor from the remainder of the interior thereof, for permitting the producing of a vacuum in the carburetor for facilitating the flow of fuel into the carburetor from the fuel tank.

. Another object of the invention is the provision in a carburetor of this class of a flexible "onlpartmcnt forming member having a vibratory wall, adapted for sealing one portion of the carburetor from the other, for producing a vacuum in the carburetor and adapted for automatically unsealing these compartments upon the flow of a sufficient amount of fuel into the carburetor for the purposes for which used.

Other objects will appear hereinafter.

The invention consists in the combination and arrangement of parts hereinafter described and claimed.

The invention will be best understood from a reference to the accoinpanying drawing which forms a part of this specification and in which,

The figure a longitudinal vertical sectional view of the invention.

The invention. as shown in the drawing, comprises a casting adapted for formingan upper wall 7, having: a flange 8 pro ect1nn' d1iwiiwardl therefrom and provided with a shoulder A cylindrical sleeve 10 is adapted for engagement between the shoulder 9 and the flange 8, a gasket 11 being interposed between the inner surfa e of the upper wall 7 and the upper edge of the sleeve 10. The lower wall of the casing is formed by a casting 12 having an up wardly extending flange 13 and a shoulder 14 and between the flange 13 and the shoulder 14, the lower edge of the cylindri- 19, 1925. Serial No. 57,831.

cal sleeve 10 is adapted to engage. A suit: able gasket 15 and a gasket 16 are in engagement with the upper surface of the wall 12. Projecting downwardly from the Wall 7 is a hollow neck 17 formed concentrically with which, in the wall 7, is a socket 18 having a wall thereof threaded. adapted for receiving: the threaded end of a pipe 19, which is provided with a head 20. The passage 21. which extends longitudinally of the pipe 19 is in communication by means of the passageways 22 with a chamber 23, formed in the bowl shaped member 24 from which projects the neck 25, said neck 25 having a passageway 26 formed therein to communicate with the chamber 23, a suit able screen 27 being positioned in the charm he 23 in embracing relation to the pipe 19, so as to thoroughly screen the fluid flowing from the passage 26 into the passage 21. A nipple 28 is threaded into the neck 25 and also threaded into a tapered nipple 29, With which suitable piping may be connected to deliver fluid into the chamber 23 from the fuel tank, which is used with the vehicle to which the carburetor is to be attached. Positioned in the carburetor. so as to form a chamber 30, is a cupshaped member hav ing side walls 31, the ends of which are angularly turned and positioned between the gaskets 15 and 16. The base of the cup-shaped member is provided with an opening: 33 to permit the passage of the pipe 19 therethrough. 1t w ll be noted that the opening 33 is of less diameter than the bore of the neck 17. so that the base 32 engages against the edge of the neck 17 when flexed upwardly into engagement therewith. It will be noted that there normally is a space between the edges of the neck 17 and the base 32.

After the cup-shaped member has been placed in position and the cylindrical sleeve 10 engaged between the flanges and the shoulders already noted, a threading of the pipe 17 into the bore 18 will serve to bind the base 12 into close engagement. so as to securely clamp the cup-shaped member in position, the threading of the pipe 19 also serving: to retain the bowl-shaped member 24 in position. Mounted in the carburetor, above the cup-shaped member, is a float 34 which is hingledly connected to a lug 35 which depends from the upper all 7. Attached to the other end of the float 34 is a clip 36 which embraces a needle 37, said needle being projected into the passageway 38 termed in the upper wall of the casting, said passageway being vertically extended and communicating with a horizontally directed passageway 39 termed in said casting, the passageway 39 communicating with the passage 40, which opens into the interior 41 of the pipe which is provided with the flange 42 for attachment to the intake manifold of the motor with which used. Threaded into the upper wall 7 is an adjustment screw valve 43 which is provided with a passageway throughout the major portion of its length, said passageway being adapted for con'lmunication through laterally extending openings with the passageway 39, the lower end of the screw forming a seat for the needle 37, the combination of the screw and the needle constituting a needle valve adapted for closing communication between the passage 39 and the chamber 44, which is formed in the carburetor above the cupshaped member. The pipe on which the flange 4:2 is formed is made integral with the upper wall 7 and communicates with the laterally turned pipe 45, which is open at its end to provide an air inlet, said open end being controlled by a suitable butterfly valve 46 mounted therein. Formed in the pipe 45, adjacent its open end, are openings 48 which may be closed by a sleeve 47 which is rotatably positioned on the pipe in a circnniferentially formed groove, the sleeve 47 being provided with openings which may be brought into registration with the openings 48.

Formed in the lower wall 12 is a passage way 49 which communicates with a groove 50 formed peripherally on a nut 51, which is threaded on the pipe 52 and into the casting, as at The groove 50 communicates through the passageways 54 with the interior of the pipe forming portion 55, so that fuel from the compartment 30 may be drawn through the passageway 49 and the groove 50 and the passages 54 into the pipe 55. (hienings 56 and 56' are formed in the pipe 55, so as to bring the interior oi the pipe 55 into conununication with the pipe 45. The diagonally extended portion which is shown in cross section and through which the pipe 55 projects is but a rib and does not form a partition so that the pipe 45 is normally in communication with the openings 56 and 56'. Threaded into the interior of the pipe 55 is a needle valve stem 57 having the knurled handle 58 for effecting a turning of the same, a transversely extending rib 59 being provided with an upwardly projecting boss 60 in which is threaded a screw 60 having formed in its end a seat for the end of the needle 57. By forming the seat in the end of the screw 60. the screw may be threaded into the boss (it) at any desired position and the seat may be entirely removed, when desired, for replacement or repair, this operation requiring very little labor and a minimum amount of tools. Communicating with the interior of the pipe 55 is a laterally extending passageway til, which conununicates with a vertically extending passageway 62 adapted for communication through the passageway formed in the screw (33 with the interior 41 ot the pipe, which is connected to the intake manifold. An auxiliary air inlet is provided on the exteriorly threaded post 64, this inlet comprising a cup shaped member (55 which is provided with openings (36. This cupshaped member is provided with an interiorly projecting needle 67 adapted for closing the opening 68 upon a threading of the member (if) inwardly sufliciently. A spring 69 is positioned within the membcr in embracing relation to the needle 67, so as to normally resist the rotating of the member 65 and thereby prevent an opening or closing, unduly, of the valve. Positioned in the interior 41 of the pipe is a sleeve adapted for forming a nozzle having an interior contour of the Venturi type. Projecting upwardly from the Venturi sleeve 70 is a finger 71 adapted upon the movement of the Ventnri sleeve for closing the communication between the interior 41 ot the pipe and the passage 62, the finger 71 being adapted to pass beyond and cover the passageway leading from the screw (53 into the interior 41. The flow of fluid through the interior 41 of the pipe is controlled by a suitable butterfly valve 72. A screw 7?) is provided tor engagement in a groove 74 formed in the Vcnturi sleeve to limit the vertical movement of the Venturi sleeve.

In operation. when the carliuretor is suitably attached to the intake manifold, the nipple is connected to the fuel tank of the mot-or vehicle with which used. As the motor is started, a suction is created through the interior 41 of the pipe to which the intake manifold is connected. The float 34 would be so arranged and positioned because of its pivotal connect on to the lug 35 as to n'iaintain the valve in the passageway open, the clip 36 assuring a withdrawal of the needle 37 upon a movement of the float 34 dowi'iwardly in response to gravity. As the suction crerted by the operating of the motor continues. the air or other fluid contained within the passages 40. 39 and 38 is exhausted as is also the tluid contained withinv the compartment 44, so as to produce a vacuum in the compartment 44. As this vacuum is produced. the base 32 of the cupshaped member is flexed upwardly into engagement with the edge of the neck 17. thereby sealing the compartment 30 from the compartment 44. As the suction continues and the va uum is ircreased, the fuel in the fuel ill) tank is "aused to flow through the passage 26 and the passage 21 into the interior of the bore lb, which communicates by the passage 18 with compartment 44. As the fuel lills the compartment 44, the float 34 rises on its pivotal connection so as to thrust the needle 37 into the seat formed in the screu 4 3, 'lhereirv sealing the connection between the cunpartutent l and the passage it). Formed in the upper wall 1' is a small air inlet passage 7 which permits a lion ot' air into the compartment ill. so that. when the ntcdle valve rlor ea the passage 38 from communication with the passage 35), sullicieut air passer: through the pas to permit a l downward movement of the base 3; to normal positioi thus permitting the 't'uel from the compartment it to pass into the compartment ill). This fact flowing through the passage it) as the suction from th engine continues. is delivered upv-iard v throufzih tl-e passages (El and (33 into the interior ll and thence to the engine. This is the path of travel of the fuel when the engine is being first started, and a small amount of fu l desired, the bu tertlv valve 72 controll Whether or not the fuel shall pass the pa'-sage\va vs (51 and 2 as i wm or directly to the engine in a larger volume. When the butterfly 'alve T2 open. "3' 'l'uel will be perm tted to pass it: a quantity to the engine. as will he z'ea ilv in rsloo l. the fuel passing i of the pipe 5:? hrough the openings it; and no. When the uitterliy valve 72 is open, to permit the pasage ol a tall supply ol the fuel to the engine. it is desirous of closing enti 'elv the towing ol' tuel through the and in order to ('t'fillllflli this the fensleeve is slideablv arr: aged in the inr ll so t'za the linger will cover the n he screw ti l.

filter the pt: =age ot' the fuel from the compartment 4t int: the c mlulrtmeut Iltl suliicicully to allow the lloat to resume such a position 1l to again open the couueetiou etween the passage I25) and the compart- :ucut ll, the process described will be rep ated. the ru ol air and fuel through the Yerturi llceve serving to set up t= c nec siarv #Wt'il ll through the pa sa s and lit The ba e l1! is als provided with a groove 49 which communicates with the passagciav id. s: as to assure a passage of all of the t'uel on the base l2 into the passage 45).

hilc l have illustrated and (la-st r bs-l the pr ferred form of stria'inre. I do not aid to limit nrvscl't' to the precise form of structure shmvir but desire to avail in zs 1' or su*h variations and modifications as collie within the scope of the appended claims.

Having thus dewcribed my invention. What I claim as new and deaire to secure by Letters Patent. is:

l. A carhurelor adapted i'or use with an l l l.

pai uages til the lenimof said member be ond a iredetermined point in one direction; fluid conducting mean communicating with one of said compartments and adapted for delivering tluid th reinto; a tloat mounteu in said compartment last mentioned; means operable by said lloat for closing communication of compartment with said manifold upon the deliver) of a predeterminetl amount of tluid into said compartment.

2. A carburetor adapted for use with an internal combustion engine having an intake manifold comprising chamber bearing means adapted tor attaclnnent to, in communication with, said manifold; a flexible member mounted in said '2 rburetor and adapted for dividing the same into a pair of compartments, said compartments being norm-all in communication with each other and said tle'ille member being adapted for sealing v comparimerits from each other upon a letting ot said member in one direction beyond a predetermined point, one of said lpartmenis being in conununicatiou \vith iii manii'old tor permitting the raret ving o't' gar-:es contained in said compartment upon the operatin o. said engine r-tld llcxible member heir adapted tor liexing beyond said prmhacrmine d point upon the ran-lying of vgal-c luid conductin' mums com- In; with said manitohl communi ca'ing c anpartiueni' mean mounted in said rompa said cl the de ad ompartment ol' :1 pre :leteruzamount ol' tluid, said comparh meat having an a r duct communieat ng ihereinto for .he llcxing ol said licxible member to normal position upon the clos ng ot said coinmuuilaeon ol' said cornbatti cut with said manif ld.

chamber into a pair of compartments normally in communication with each other, said base being adapted for sealing said compartn'ients from communication with each other upon flexing in one direction beyond a predetermined point, one of said compartments being normally in communication with said manifold; and means in said compartment for closing said communication automatically.

In testimony whereof, I have signed the foregoing specification.

HALSEY C. ABERN. 

